将值传递给打字稿箭头功能

Question

I am attempting to write a javascript function in typescript - however I'm finding it impossible to search for how to achieve it. This is the javascript code I want to convert to typescript

var file = files[i];
var reader = new FileReader();

reader.onload = (function(f) {
    return function(e) {
    };
})(file);

The closest I have got is but I'm not sure how to pass the (file) like above:

var file = files[i];
var reader = new FileReader();

reader.onloadend = (file: any) => {
    return (loadEvent: any) => {
    }
}

Answer 1

It should be something like this:

var file = files[i];
var reader: FileReader = new FileReader();

reader.onload = ((f: any) => {
    return (e: any) => {
        // some code
    };
})(file);